HP Officejet 4500 (G510) - FTP Directory Listing - Hewlett Packard
HP Officejet 4500 (G510) - FTP Directory Listing - Hewlett Packard
HP Officejet 4500 (G510) - FTP Directory Listing - Hewlett Packard
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Error messages appear<br />
"Unable to activate TWAIN source" or "An error occurred while acquiring the<br />
image"<br />
◦ If you are acquiring an image from another device, such as a digital camera or another<br />
scanner, make sure that the other device is TWAIN-compliant. Devices that are not<br />
TWAIN-compliant do not work with the device software.<br />
◦ Make sure that you have connected the USB cable to the correct port on the back of<br />
your computer.<br />
◦ Verify that the correct TWAIN source is selected. In the software, check the TWAIN<br />
source by selecting Select Scanner on the File menu.<br />
Scanned image quality is poor<br />
The original is a second-generation photo or picture<br />
Reprinted photographs, such as those in newspapers or magazines, are printed by using<br />
tiny dots of ink that make an interpretation of the original photograph, which degrades the<br />
quality. Often, the ink dots form unwanted patterns that can be detected when the image<br />
is scanned or printed or when the image appears on a screen. If the following suggestions<br />
do not solve the problem, you might need to use a better-quality version of the original.<br />
◦ To eliminate the patterns, try reducing the size of the image after scanning.<br />
◦ Print the scanned image to see if the quality is better.<br />
◦ Make sure that the resolution and color settings are correct for the type of scan job.<br />
Text or images on the back of a two-sided original appear in the scan<br />
Two-sided originals can "bleed" text or images from the back side to the scan if the<br />
originals are printed on media that is too thin or too transparent.<br />
The scanned image is skewed (crooked)<br />
The original might have been placed incorrectly. Be sure to use the media guides when<br />
you place the original on the scanner glass. For more information, see Load an original<br />
on the scanner glass.<br />
The image quality is better when printed<br />
The image that appears on the screen is not always an accurate representation of the<br />
quality of the scan.<br />
◦ Try adjusting your computer monitor settings to use more colors (or levels of gray).<br />
On Windows computers, you typically make this adjustment by opening Display on<br />
the Windows control panel.<br />
◦ Try adjusting the resolution and color settings.<br />
The scanned image shows blots, lines, vertical white stripes, or other defects<br />
◦ If the scanner glass is dirty, the image produced does not have optimum clarity. See<br />
Maintain the device for cleaning instructions.<br />
◦ The defects might be on the original and not a result of the scanning process.<br />
Graphics look different from the original<br />
The graphics settings might not be suitable for the type of scan job that you are<br />
performing. Try changing the graphics settings.<br />
Solve scan problems 99